The role of a discontinuous free-electron density in harmonic generation from metal surfaces and metal/oxide boundaries (Conference Presentation)

Michael Scalora; Crina Cojocaru; Jose Trull; Maria Vincenti; Domenico de Ceglia; Mark Bloemer; Neset Akozbek; Joseph Haus; Ramon Vilaseca; Costantino De Angelis

doi:10.1117/12.2320704

17 September 2018 The role of a discontinuous free-electron density in harmonic generation from metal surfaces and metal/oxide boundaries (Conference Presentation)

Michael Scalora, Crina Cojocaru, Jose Trull, Maria Vincenti, Domenico de Ceglia, Mark Bloemer, Neset Akozbek, Joseph Haus, Ramon Vilaseca, Costantino De Angelis

Author Affiliations +

Proceedings Volume 10721, Active Photonic Platforms X; 1072107 (2018) https://doi.org/10.1117/12.2320704
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

We discuss a dynamical model of harmonic generation that arises from surfaces that demarcate two different metals or conductors, or the electron cloud that spills outside a simple metal surface and the interior bulk, having different electron densities, for example a noble metal such as gold, and indium tin oxide (ITO). While in general two adjacent materials may contain free and bound charges that determine their respective dielectric constants, the transition region may be characterized by a large discontinuity in the free electron density, , epsilon-near-zero conditions, or multiple, nested plasmonic resonances. For example, , while the free-electron cloud that spills outside a noble metal surface decreases as a function of position from the hard ionic surface. These discrepancies lead to the prediction that the angular dependence of second harmonic generation (SHG) from a simple planar structure is direction-dependent, and highlights the sensitivity of both SHG and third harmonic generation to the makeup of the surface and what surrounds it. Our calculations also suggest that the nonlinear optical analysis of more complicated, hybrid structures, such as metal/oxide nanoantennas or metasurfaces, should always be performed by including effects that are generally overlooked, such as nonlocal effects (viscosity and pressure); the presence of linear and nonlinear quantum tunneling currents in the nano- and sub nano-gaps between the nanoantenna and embedded nanoparticles; linear and nonlinear contributions of bound (inner-core) electrons to the dielectric constant.

Conference Presentation

Citation Download Citation

Michael Scalora, Crina Cojocaru, Jose Trull, Maria Vincenti, Domenico de Ceglia, Mark Bloemer, Neset Akozbek, Joseph Haus, Ramon Vilaseca, and Costantino De Angelis "The role of a discontinuous free-electron density in harmonic generation from metal surfaces and metal/oxide boundaries (Conference Presentation)", Proc. SPIE 10721, Active Photonic Platforms X, 1072107 (17 September 2018); https://doi.org/10.1117/12.2320704

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Metals

Harmonic generation

Clouds

Dielectrics

Nanoantennas

Nonlinear optics

Second-harmonic generation

Show All Keywords

Keywords/Phrases

Search In:

Publication Years